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[VPlan] Update scalar induction resume values in VPlan. #110577

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merged 27 commits into from
Dec 6, 2024
Merged

[VPlan] Update scalar induction resume values in VPlan. #110577

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33b3aac
[VPlan] Update induction resume values in VPlan.
fhahn Sep 30, 2024
8040cdb
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 9, 2024
c98b6d3
!fixup simplify code, update remaining tests.
fhahn Nov 9, 2024
a14749c
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 9, 2024
d3728f4
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 10, 2024
ad1f578
!fixup only update InductionBypassValues if there's a bypass.
fhahn Nov 10, 2024
a11bca4
!fixup update comment.
fhahn Nov 10, 2024
56e82ef
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 16, 2024
e8d78a9
!fixup address latest comments, thanks!
fhahn Nov 16, 2024
c7a5b03
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 20, 2024
5d2eb8b
!fixup address latest comments, thanks!
fhahn Nov 20, 2024
9393eda
!fixup fix formatting
fhahn Nov 20, 2024
c54e8f2
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 24, 2024
d8717f9
!fixup fix build failure
fhahn Nov 24, 2024
3e5dbff
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Nov 28, 2024
a02b278
!fixup update remaining tests
fhahn Nov 28, 2024
674d15b
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Dec 1, 2024
6998270
!fixup address latest comments, thanks
fhahn Dec 1, 2024
55cd843
!fixup remove redundant phi
fhahn Dec 1, 2024
e292a3d
!fixup formatting, undo unnecessary test changes
fhahn Dec 1, 2024
93f3304
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Dec 4, 2024
ce214f5
!fixup address latest comments, thanks!
fhahn Dec 4, 2024
b37e297
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Dec 5, 2024
a1d2a13
!fixup address comments and reduce some test diffs
fhahn Dec 5, 2024
61e6d95
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Dec 6, 2024
e96323f
!fixup adjust comments, pass IV phi filter.
fhahn Dec 6, 2024
c964dad
Merge remote-tracking branch 'origin/main' into vplan-induction-resum…
fhahn Dec 6, 2024
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241 changes: 144 additions & 97 deletions llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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5 changes: 4 additions & 1 deletion llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -629,7 +629,10 @@ Value *VPInstruction::generate(VPTransformState &State) {
State.CFG
.VPBB2IRBB[cast<VPBasicBlock>(getParent()->getSinglePredecessor())];
NewPhi->addIncoming(IncomingFromVPlanPred, VPlanPred);
for (auto *OtherPred : predecessors(Builder.GetInsertBlock())) {
// TODO: Predecessors are temporarily reversed to reduce test changes.
// Remove it and update remaining tests after functional change landed.
for (auto *OtherPred :
reverse(to_vector(predecessors(Builder.GetInsertBlock())))) {
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Better reverse the predecessors when they are set, rather than here during VPlan::execute()?

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This is just to keep the number of test changes lower by trying to better match the order in the phis and should be dropped after landing this change as follow up. Added a TODO

assert(OtherPred != VPlanPred &&
"VPlan predecessors should not be connected yet");
NewPhi->addIncoming(IncomingFromOtherPreds, OtherPred);
Expand Down
13 changes: 5 additions & 8 deletions llvm/test/Transforms/LoopVectorize/AArch64/epilog-vectorization-widen-inductions.ll
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Expand Up @@ -143,11 +143,10 @@ define void @test_widen_induction(ptr %A, i64 %N) {
; CHECK-NEXT: [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
; CHECK-NEXT: br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
; CHECK: vec.epilog.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[N_MOD_VF2:%.*]] = urem i64 [[N]], 2
; CHECK-NEXT: [[N_VEC3:%.*]] = sub i64 [[N]], [[N_MOD_VF2]]
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[BC_RESUME_VAL]], i64 0
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[VEC_EPILOG_RESUME_VAL]], i64 0
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
; CHECK-NEXT: br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
Expand Down Expand Up @@ -205,10 +204,10 @@ define void @test_widen_induction_variable_start(ptr %A, i64 %N, i64 %start) {
; CHECK: vector.ph:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = add i64 [[START]], [[N_VEC]]
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[START]], i64 0
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
; CHECK-NEXT: [[IND_END:%.*]] = add i64 [[START]], [[N_VEC]]
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -322,11 +321,10 @@ define void @test_widen_induction_step_2(ptr %A, i64 %N, i32 %step) {
; CHECK-NEXT: [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
; CHECK-NEXT: br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
; CHECK: vec.epilog.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END4]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[IND_END4]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[N_MOD_VF2:%.*]] = urem i64 [[N]], 2
; CHECK-NEXT: [[IND_END:%.*]] = sub i64 [[N]], [[N_MOD_VF2]]
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[BC_RESUME_VAL]], i64 0
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[VEC_EPILOG_RESUME_VAL]], i64 0
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
; CHECK-NEXT: br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
Expand Down Expand Up @@ -433,7 +431,7 @@ define void @test_widen_extended_induction(ptr %dst) {
; CHECK: vec.epilog.middle.block:
; CHECK-NEXT: br i1 true, label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
; CHECK: vec.epilog.scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi i8 [ 16, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 16, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_SCEVCHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi i8 [ 16, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 16, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ], [ 0, [[VECTOR_SCEVCHECK]] ]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i8 [ [[BC_RESUME_VAL1]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
Expand Down Expand Up @@ -491,9 +489,8 @@ define void @test_widen_truncated_induction(ptr %A) {
; CHECK: vec.epilog.iter.check:
; CHECK-NEXT: br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
; CHECK: vec.epilog.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[TMP5:%.*]] = trunc i64 [[BC_RESUME_VAL]] to i8
; CHECK-NEXT: [[TMP5:%.*]] = trunc i64 [[VEC_EPILOG_RESUME_VAL]] to i8
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i8> poison, i8 [[TMP5]], i64 0
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT]], <2 x i8> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <2 x i8> [[DOTSPLAT]], <i8 0, i8 1>
Expand Down
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